The first day covers, stamps and linen designed by your in-laws may well be marketable, or of interest to a museum with a relevant collection.
If the younger members of your family are interested, then hand the stuff over to them. If they are not, there is no point in keeping it for putative future generations of the family.
Photos of unknown people are only interesting if they clearly depict the fashions or manners of their day, and if you can find the archive or museum that wants them.
So you start by finding out if there are libraries, museums. archives or private collectors that want the good stuff.
At the same time, you dispose of the rubbish, and take the better, but uninteresting things to the local charity shops.
Husband I think is looking for divorce after 50 years.
Can anyone recommend a non sticky body lotion?
Support and friendship for those whose lives have been affected by estrangement.

